[GitHub] [flink] twalthr commented on a change in pull request #8050: [FLINK-11067][table] Convert TableEnvironments to interfaces

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twalthr commented on a change in pull request #8050: [FLINK-11067][table] Convert TableEnvironments to interfaces
URL: https://github.com/apache/flink/pull/8050#discussion_r277613272
 
 

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 File path: flink-table/flink-table-common/src/main/java/org/apache/flink/table/descriptors/Rowtime.java
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 @@ -0,0 +1,140 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.table.descriptors;
+
+import org.apache.flink.annotation.PublicEvolving;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.table.sources.tsextractors.TimestampExtractor;
+import org.apache.flink.table.sources.wmstrategies.WatermarkStrategy;
+
+import java.util.Map;
+
+/**
+ * Rowtime descriptor for describing an event time attribute in the schema.
+ */
+@PublicEvolving
+public class Rowtime implements Descriptor {
+
+	private final DescriptorProperties internalProperties = new DescriptorProperties(true);
+
+	public static final String ROWTIME = "rowtime";
 
 Review comment:
   These static fields should rather go into a `RowtimeValidator` class as they mess up the API class otherwise.

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